Constructors in a singleton

[tkks]

Hi all,

I need to implement a singleton, so I've been reading about it online and I'm still not quite sure about all the types of constructors I need to declare:

class my_singleton {
	private:
		my_singleton();
		my_singleton(my_singleton & X);
		my_singleton(const my_singleton & X);
		...
		static bool instance;
		...
	public:
		static my_singleton* get_instance();
		...
		~my_singleton();
}

Is this OK?

Thanks.